Mullion strip



FIG. 1 is a fragmentary top perspective view of the mullion strip showing my design;

FIG. 2 is a top plan view thereof broken away to indicate indeterminate length;

FIG. 3 is a bottom plan view thereof broken away to indicate indeterminate length;

FIG. 4 is a front elevational view thereof in which the rear elevational view is a mirror image of the front view;

FIG. 5 is a right elevational view thereof broken away to indicate indeterminate length; and,

FIG. 6 is a left elevational view thereof broken away to indicate indeterminate length. 

The ornamental design for a mullion strip, as shown and described. 